I keep getting alerts even though I deleted my post from a thread. Like I said it's no biggy, just annoying.
Just unwatch from the thread. Auto unwatching would be fraught with potential for getting it wrong - you'd have to know if the watch was automatic from posting or manual from the menu option, if they had other posts and if those other posts had opted to watch.
Watching a thread has nothing to do with posting in it. You can watch threads that you never posted in for example. At the top of the thread, click the "Unwatch" link.
So Watching Thread and getting alerts are connected. I just thought maybe by deleting my post I automatically get it unwatched too. Will remember to unwatch it after deleting a post next time.
Correct... Watching a thread and getting alerts aren't just "connected", they are one and the same. That's the purpose of watching threads (to get alerts).